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Big hole in the side of mountain in a desert, stick the waste in, full it with rubble and concrete, job done. If some primatives in a hundred thousand years stumble across it and dig it out, fuck em, who cares.
Dig a hole, anywhere, now leave. What will the hole eventually fill up with?
The pyramids have chambers that were unopened for over four thousand years, bone dry inside. Pick an area with very little rainfall, surround it with rock and the problem will stop existing on human timescales.
https://www.livescience.com/was-ancient-egypt-a-desert